Functional assessment of differential sediment slurry applications in a deteriorating brackish marsh

Graham, Sean A.; Mendelssohn, Irving A.

doi:10.1016/j.ecoleng.2012.12.031

Cited by 31 publications

(4 citation statements)

References 33 publications

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“…The interaction between inorganic sediment deposition and overall wetland health and stability is complex, however. Tides and heavy precipitation can remove recently deposited loose and unconsolidated material [18], while sediments can weigh on wetland surfaces, causing a decrease in elevation to pre-input levels in as little as 2.5 years [41]. Meanwhile, elevated accretion rates from marsh flooding could be from accumulated organic matter from root growth, instead of mineral accumulation via deposition [42].…”

Section: The Role Of Hurricanes As "Land-builders" For Coastal Louisianamentioning

confidence: 99%

Wetland Accretion Rates Along Coastal Louisiana: Spatial and Temporal Variability in Light of Hurricane Isaac’s Impacts

Bianchette

Liu

Qiang

et al. 2015

Water

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Abstract:The wetlands of the southern Louisiana coast are disappearing due to a host of environmental stressors. Thus, it is imperative to analyze the spatial and temporal variability of wetland vertical accretion rates. A key question in accretion concerns the role of landfalling hurricanes as a land-building agent, due to their propensity to deposit significant volumes of inorganic sediments. Since 1996, thousands of accretion measurements have been made at 390 sites across coastal Louisiana as a result of a regional monitoring network, called the Coastal Reference Monitoring System (CRMS).We utilized this dataset to analyze the spatial and temporal patterns of accretion by mapping rates during time periods before, around, and after the landfall of Hurricane Isaac (2012). This analysis is vital for quantifying the role of hurricanes as a land-building agent and for understanding the main mechanism causing heightened wetland accretion. The results show that accretion rates averaged about 2.89 cm/year from stations sampled before Isaac, 4.04 cm/year during the period encompassing Isaac, and 2.38 cm/year from sites established and sampled after Isaac. Accretion rates attributable to Isaac's effects were therefore 40% and 70% greater than before and after the event, respectively, indicating the event's importance toward coastal land-building. Accretion associated with Isaac was highest at sites located 70 kilometers from the storm track, particularly those near the Mississippi River and its adjacent distributaries and lakes. This spatial pattern of elevated accretion rates indicates that freshwater flooding from fluvial channels, rather than storm surge from the sea per se, is the main mechanism responsible for increased wetland accretion. This significance of riverine flooding has implications toward future coastal restoration policies and practices.

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Section: The Role Of Hurricanes As "Land-builders" For Coastal Louisianamentioning

confidence: 99%

Wetland Accretion Rates Along Coastal Louisiana: Spatial and Temporal Variability in Light of Hurricane Isaac’s Impacts

Bianchette

Liu

Qiang

et al. 2015

Water

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“…Keogh et al (2019) found that the Davis Pond freshwater diversion effectively captures fine-grained sediment, demonstrating that during moderate and low flow conditions in the summer and fall the sediment retention rate is up to 81%. Increased soil mineral content and consolidation of deposited muddy sediment has been shown to reduce vulnerability of Mississippi River Delta freshwater wetlands to impacts from erosive forces, sea level rise and subsidence (Morris et al 2013;Graham and Mendelssohn, 2013;Slocum et al 2005, Xu et al, 2019, especially when that sediment is accompanied by increased OM accumulation. Root systems of wetland plant communities are an important structural component for highly organic soils (DeLaune and .…”

Section: Sedimentation From Diversion Influencementioning

confidence: 99%

Spatial and temporal changes to a hydrologically-reconnected coastal wetland: Implications for restoration

Spera

White

Corstanje

2020

Estuarine, Coastal and Shelf Science

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Mississippi River Delta wetlands were isolated from river influence due to leveeing in the 1900's. Surface water diversions were primarily designed to manage salinity and maintain marsh vegetation by reintroducing Mississippi River water and nutrients into adjacent wetlands.Phosphorus (P) is a major limiting nutrient that can control productivity, but in excess can contribute to wetland eutrophic conditions and water quality degradation. Most wetland soil characterization assessments consider soil total P, however, this parameter alone cannot describe P bioavailability due to difference in organic and inorganic forms. A soil characterization of the Davis Pond diversion was done in 2007, before full-scale operation began, and in 2018 after 11 years of river loading. The top 10 cm of soil from 140 stations each year were analyzed for physiochemical properties and both organic and inorganic P forms. Mineral content is used to delineate areas of river diversion influence and compare P stocks between hydrologically isolated marsh areas and where effective river diversion reconnection took place. The river diversion resulted in a nearly 100% increase in soil mineral content and 58% increase in bulk density. The dominant source of soil P has changed from organic P to inorganic P in 29% of the wetland area, significantly associated with mineral content of the soil. Inorganic P stocks in diversion influenced areas are 9 times higher than those which remained isolated from riverine materials. The study showed that long-term addition of mineral sediments and inorganic P did not lead to deleterious effects in the wetland. This is the first study in the Mississippi River delta

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“…Similar to Spartina alterniflora, Spartina patens (saltmeadow cordgrass) is a key species in the classification of wetland habitats. Commonly known as wiregrass, S. patens is part of the Brackish and Brackish mixture (with Distichlis spicata) class [39,69,[90][91][92]. AGB maximum values ranged from 500 to 7500 g m −2 (Table S2).…”

Section: Spartina Patensmentioning

confidence: 99%

Wetland Biomass and Productivity in Coastal Louisiana: Base Line Data (1976–2015) and Knowledge Gaps for the Development of Spatially Explicit Models for Ecosystem Restoration and Rehabilitation Initiatives

Rivera‐Monroy

Elliton

Narra

et al. 2019

Water

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Coastal Louisiana hosts 37% of the coastal wetland area in the conterminous US, including one of the deltaic coastal regions more susceptible to the synergy of human and natural impacts causing wetland loss. As a result of the construction of flood protection infrastructure, dredging of channels across wetlands for oil/gas exploration and maritime transport activities, coastal Louisiana has lost approximately 4900 km2 of wetland area since the early 1930s. Despite the economic relevance of both wetland biomass and net primary productivity (NPP) as ecosystem services, there is a lack of vegetation simulation models to forecast the trends of those functional attributes at the landscape level as hydrological restoration projects are implemented. Here, we review the availability of peer-reviewed biomass and NPP wetland data (below and aboveground) published during the period 1976–2015 for use in the development, calibration and validation of high spatial resolution (<200 m × 200 m) vegetation process-based ecological models. We discuss and list the knowledge gaps for those species that represent vegetation community associations of ecological importance, including the long-term research issues associated to limited number of paired belowground biomass and productivity studies across hydrological basins currently undergoing different freshwater diversions management regimes and hydrological restoration priorities.

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Functional assessment of differential sediment slurry applications in a deteriorating brackish marsh

Cited by 31 publications

References 33 publications

Wetland Accretion Rates Along Coastal Louisiana: Spatial and Temporal Variability in Light of Hurricane Isaac’s Impacts

Wetland Accretion Rates Along Coastal Louisiana: Spatial and Temporal Variability in Light of Hurricane Isaac’s Impacts

Spatial and temporal changes to a hydrologically-reconnected coastal wetland: Implications for restoration

Wetland Biomass and Productivity in Coastal Louisiana: Base Line Data (1976–2015) and Knowledge Gaps for the Development of Spatially Explicit Models for Ecosystem Restoration and Rehabilitation Initiatives

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